【題目】The computer is used not only to play games but ____a tool for learning.

A. by B. as C. for D. to

【答案】B

【解析】

句意：電腦不僅被用來玩游戲，而且被用作學(xué)習(xí)的工具。be used by被……使用， be used as被用作，be used for被用于，be used to do sth被用來做某事，故選B。

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